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word - marric
word - marric

... Organism that consume plants are called primary consumers and are also called herbivores (eat plants) – second trophic level. Any organism that must eat another organism is called a heterotroph (other eater). Organisms that eat primary consumers are called secondary consumers and can either be omniv ...
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... 5. Which of the following would NOT complete this sentence: Phytoplankton __________________. A. are free-floating organisms B. are unicellular C. live only in saltwater environments D. are fed on by zooplankton 6. Ecologists group Earth’s diverse environments into: A. Niches B. Biomes C. Classes D. ...
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... are home to small animals, such as snails and insects. Clams and worms bury themselves in the mud. Frogs, salamanders, turtles, fish, and snakes also live in this zone. Life Away from Shore. The area of a lake or pond that extends from the littoral zone across the top of the water is called the open ...
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... State that the Sun is the principal source of energy input to biological systems  The Earth receives two main types of energy from the sun: light (solar) and heat;  Photosynthetic plants and some bacteria can trap light energy and convert it into chemical energy;  Heterotrophic organisms obtain t ...
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ecology - Auburn School District

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Lake ecosystem

A lake ecosystem includes biotic (living) plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions.Lake ecosystems are a prime example of lentic ecosystems. Lentic refers to stationary or relatively still water, from the Latin lentus, which means sluggish. Lentic waters range from ponds to lakes to wetlands, and much of this article applies to lentic ecosystems in general. Lentic ecosystems can be compared with lotic ecosystems, which involve flowing terrestrial waters such as rivers and streams. Together, these two fields form the more general study area of freshwater or aquatic ecology. Lentic systems are diverse, ranging from a small, temporary rainwater pool a few inches deep to Lake Baikal, which has a maximum depth of 1740 m. The general distinction between pools/ponds and lakes is vague, but Brown states that ponds and pools have their entire bottom surfaces exposed to light, while lakes do not. In addition, some lakes become seasonally stratified (discussed in more detail below.) Ponds and pools have two regions: the pelagic open water zone, and the benthic zone, which comprises the bottom and shore regions. Since lakes have deep bottom regions not exposed to light, these systems have an additional zone, the profundal. These three areas can have very different abiotic conditions and, hence, host species that are specifically adapted to live there.
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